Pt nano-particles decorated poly aniline/platinum/aluminum electrode and their catalytic activity towards methanol oxidation

Recent developments in the preparation of micro- and nano-structured metal particles and their dispersion in porous materials have opened up the possibility of preparation of high performance electrocatalysts for technologically important reactions. Several procedures have been employed to prepare Pt supported nano-particles on different supports [1]. On the other hand, electrochemical deposition is an efficient method for the preparation of metal particles. It is widely used with different strategies/methodologies, such as cyclic voltammetry [2], potential step deposition [3] and double-pulse [4]. Among these, potential step deposition provides a tool to fine-tune the amount of metal deposited, the number of metallic sites and their size.Conducting polymers are useful supports for the immobilization of dispersed nano-particles of noble metal catalysts, due to the prevention of particle agglomeration. The porous structure and high surface area of many conducting polymers have led to their use as supporting materials in the development of new electrocatalytic materials. Due to the relative high electric conductivity of some polymers it is possible to transfer electrons through polymer chains, between the electrode and dispersed metal particles, where the electrocatalytic reaction occurs [5].In this paper we report the electrosynthesis of poly aniline, PANI, on the pre-treated aluminum surface with Pt particles, characterization of the polymer coated electrodes and preparation of a polymeric electrode by dispersing the Pt nano-particles in PANI as a matrix under potential step deposition. The resulting modified electrode was characterized by scanning electron microscopy (SEM) and cyclic voltammetry was used to evaluate the electroactivity with respect to the oxidation of methanol

کلیدواژه ها:

Platinum nano-particles ، Al/Pt electrode ، poly aniline composite electrode ، methanol oxidation